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《Journal of Zhejiang University(Engineering Science)》 2007-09
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Sensorless operation for direct torque control of permanent magnet synchronous motor

JIA Hong-ping1,2,HE Yi-kang1(1.College of Electrical Engineering,Zhejiang University,Hangzhou 310027,China;2.School of Electrical and Information Engineering,Jiangsu University,Zhenjiang 212013,China)  
A new speed estimation method based on the inspection of instantaneous power angle was proposed to solve the problems associated with the conventional direct torque control(DTC) of permanent magnet synchronous motor(PMSM),such as high current,flux and torque ripple,variable switching frequency,and to eliminate speed sensor since it deteriorated system reliability and increased the cost of system.The scheme realizes the sensorless DTC operation for PMSM based on the variable structure sliding mode(VSS) control strategy.Experimental results verified that the proposed control scheme significantly reduced the current, flux and torque ripple,effectively suppressed the high-frequency noise,while preserved the quick dynamic torque response merit and showed robustness to the motor parameter uncertainty.The scheme effectively improves the dynamic and static operation performance and the system reliability.
【Fund】: 国家自然科学基金资助项目(50237030 50477310)
【CateGory Index】: TM341;TM921.5
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